\documentclass{article}
\usepackage[margin=1in]{geometry} % 调整页边距为1英寸
 
% 定义自定义列类型，并设置列间距为0.5cm
\newcolumntype{P}[1]{>{\hspace*{#1}}p{.8\textwidth}}
 
\begin{document}
    \begin{center}
        \renewcommand{\arraystretch}{1.2}% 调整行高
        \setlength{\tabcolsep}{3mm}% 调整列间距
        
        \begin{tabular}{|c|P{0.7cm}|}\hline
            Header & Paragraph \\ \hline
            第一行 & This is the first paragraph in this table. It has been indented by 0.7 cm.\\ \hline
            第二行 & This is another paragraph in this table. Again, it has been indented by 0.7 cm.\\ \hline
        \end{tabular}
    \end{center}
\end{document}